. >> the great debate five days away. why romney has to win andwhyobamacan'tafford to lose. i'll talk to my political a-team. also, bibi and the bomb. >> a red line should be drawn right here. >> after dropping this on the u.n. yesterday, he talks to obama and romney today. what israel's line in the sand would mean for all of us. plus, have you seen chelsea lately? >> nobody knows what the hell they're getting into when they're running for president. >> one of my favorites guests is back. >> i'm single, yes. >> if men are watching this -- >> yeah, i'm available. you know, just call me maybe. >> funny, feisty as ever, with a new look for her talk show. this is "piers morgan tonight." >>> good evening. the big story, the great debate. in just five days the event that could change the race for the white use permanently. the clock is ticking and the candidates know it. they meet face-to-face on wednesday. this weekend, both will be locked behind closed doors in practice sparring sessions. romney has listed senator rob portman to prep him while obama is working with senator john kerry. latest po